Today's Message Index:
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1. 06:01 PM - Re: Rejetting a 914 during Winter? (Roger Lee)
2. 06:36 PM - Re: Re: Rejetting a 914 during Winter? (Ivan)
3. 08:04 PM - Re: Rejetting a 914 during Winter? (darinh)
Message 1
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| Subject: | Re: Rejetting a 914 during Winter? |
Don't worry about the jetting. Re-pitch the prop. You will loose 100-125 engine
rpm due to the colder denser winter air verses the warmer summer air with the
prop. We do it in Tucson all the time. The summer temps are 90 F + and the winter
mornings are 32-40F. You will run better. Take out approximately 1/2 degree
to pick up another 100 rpm.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=223466#223466
Message 2
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| Subject: | Re: Rejetting a 914 during Winter? |
Why are we flattening the prop pitch? Are we doing this for better climb or
are we doing this for mixture control with the Bing altitude compensating
carburetor having a needle to control the mixture rather than a mixture
control? I thought flattening the prop will make it run leaner and we want
to richen up things a bit for the winter? I am confused about something.
Ivan
----- Original Message -----
From: "Roger Lee" <ssadiver1@yahoo.com>
Sent: Wednesday, January 07, 2009 6:57 PM
Subject: RotaxEngines-List: Re: Rejetting a 914 during Winter?
>
> Don't worry about the jetting. Re-pitch the prop. You will loose 100-125
> engine rpm due to the colder denser winter air verses the warmer summer
> air with the prop. We do it in Tucson all the time. The summer temps are
> 90 F + and the winter mornings are 32-40F. You will run better. Take out
> approximately 1/2 degree to pick up another 100 rpm.
>
> --------
> Roger Lee
> Tucson, Az.
> Light Sport Repairman - Maintenance Rated
> Rotax Service Center
> 520-574-1080
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=223466#223466
>
>
>
Message 3
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| Subject: | Re: Rejetting a 914 during Winter? |
Roger,
Thanks for the post but I have an Airmasters CS prop so that is not the issue.
It is not a problem with load on the prop, rather when it hits the top 10% of
throttle, it runs a bit rough as though it is jetted wrong.
My understanding is that the main jet controls the top end and the engine is smooth
as silk through the the range from idle to approximately 90% throttle then
is runs rough so this is why I was thinking it may have something to do with
the main jetting.
--------
Darin Hawkes
Series 7
914 Turbo
Kaysville, Utah
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=223487#223487
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